Download Computation in Living Cells: Gene Assembly in Ciliates by Andrzej Ehrenfeucht, Tero Harju, Ion Petre, David M. PDF

By Andrzej Ehrenfeucht, Tero Harju, Ion Petre, David M. Prescott, Grzegorz Rozenberg

Natural Computing is anxious with computation that's happening in Nature. The research of computations in dwelling cells is among the primary and quickest transforming into parts of study during this box. Gene meeting in ciliates (unicellular organisms) is a well suited instance of such computations, and it's interesting from either the organic and the computational viewpoints. in actual fact, either biology and the technology of computation have benefited from the interdisciplinary learn at the computational nature of gene meeting – this paintings has helped to explain very important organic points of gene meeting, yielded novel insights into the character of computation, and broadened our figuring out of what computation is ready.

This monograph offers an obtainable account of either the biology and the formal research of the gene meeting procedure. it may be used as a textbook for both graduate classes or seminars.

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This species has two macronuclei (MA) and four micronuclei (MI). Two food vacuoles (FV) are also visible. m. Courtesy of Gopal Murti The Micronucleus Micronuclei in stichotrichs and other ciliates contain typical eukaryotic chromosomes, and micronuclei divide by mitosis during cell reproduction. However, micronuclear chromosomes differ dramatically in function from chromosomes in the nuclei of other kinds of eukaryotes. , they are not expressed (not transcribed and translated). Thus, micronuclei lack the major function of synthesizing RNA , and they make no contribution to the growth and reproduction of the cell.

The sole function of the micronucleus is in the exchange of genomes during mating between two ciliates. e .. RNA transcripts, needed in the cytoplasm to carry out protein synthesis are provided by the genes in the macronuclei: these genes are continuously expressed at a high rate. Reaction to Starvation If nutrients, in the form of food organisms, are available to stichotrichs, they grow and reproduce by cell division. When food organisms become scarce, and a stichotrich begins to starve, it may embark on one of three other fates: it may form an inert cyst, it may mate with another starving stichotrich of the same species, or it may become cannibalistic, ingesting other members of its own species.

9. a Repeat sequences in MDSs 4-6-5-7 in the micronuclear actin gene. Note the matching of the repeats between the right end of MDS 4 and the left end of MDS 5, between the right end of MDS 5 and the left end of MDS 6, and between the right end of MDS 6 and the left end of MDS 7. b The matchings facilitate joining of these four MDSs in the orthodox order, 4-5-6-7. One copy of each repeat is excised with the lESs. 32 2 Ciliates CTCCCAAGTCCAT .. with the sequences at their ends. MDS 4 ends in GAGGGTTCAGGTA' whIch IS repeated at the beginning of MDS 5.

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